A furnace that will not ignite has stopped at one specific point in a fixed sequence, and which point it is tells you almost everything.

Short cycling is a furnace starting, running a few minutes, shutting down before the house reaches temperature, then starting again. The most common cause by

Check the thermostat, the furnace power switch, the breaker and the blower door first — those four account for a large share of no-heat calls.

A furnace blowing cold air is most often a thermostat setting rather than a broken part. Check the fan setting first, then the filter, then

If a carbon monoxide alarm is sounding right now: get everyone out of the building and call emergency services. Do not look for the source.

A furnace that shuts itself off is usually a safety device doing its job. The switch is not the fault — it is the report

Boulder homes are heated three different ways, and each one fails differently in January. About seven in ten run on natural gas, roughly one in

A Boulder winter bill is driven by three things: how much backup heat your system runs, what your thermostat is actually set to do, and